Found in the 1989 Radio Electronics Experimenter special edition, this circuit was designed for assembly with SMD components. The printed circuit board was provided.
This circuit with RIAA equalization is from 1985 US documentation. The circuit has a flat response...
Found in Popular Electronics from the 1980s, this circuit can use more modern transistors such as...
This circuit appears in other articles in this section, but it is very interesting. It is a...